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Donald Trump’s former national security adviser Michael Flynn just became the fourth — and potentially the most important — person charged in Special Counsel Bob Mueller’s investigation into whether the Trump administration colluded with Russia during and after the election.

Back in February 2016, Flynn, a retired three-star general, was one of the first high-level people to join Trump’s campaign, later making him a senior member of the transition team. And just 10 days after the election, Trump had already named Flynn as national security adviser, a role that would give him nearly unfettered access to White House secrets.